Question about 1990 Lincoln Mark VII

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Is a computer needed to bleed brake system?

I have a 1990 Mark VII LSC that has lost brakes. It has the ABS brake system. A mechanic looked at it & told me that a computer is required to bleed the brakes after the master brake cylinder is replaced thru Ford.
Is that true?? He also said the car is not worth fixing even though the air ride was replaced with springs within the last year & the engine is running GREAT!!
Please help. I really love the car & would hate to sell it as salvage.

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  • venostasgal Feb 16, 2009

    Thanks. I kind of figured there had to be another way, other than what the mechanic told me.

  • venostasgal Feb 16, 2009

    Thanks. I kind of figured there had to be another way, other than what the mechanic told me.

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Bleed the brakes the easy way is to have two peoples one to pump the brake pedal and the other one is to open the bleeder use the driver side front wheel it close to the master cylinder and you could get a brake bleeder and do it by yourself.

Posted on Feb 16, 2009

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1 Answer

I have 1990 lsc and i just put a new battery in it and now it is dead . does it have a dead short


If nothings is staying on and the batt still goes dead just sitting. pull the abs fuse, these sys are a problem. the abs pumps stay on and kill the batt. you should here a vib by the master cyc. and you might have a abs light on. remember when you pull the fuse the abs sys will not be working , you will have brakes just not abs. one part to fix it costs around 200.00 dollars the other part is around 1200.00. hope this helps

Nov 14, 2010 | 1990 Lincoln Mark VII

2 Answers

1988 Lincoln Mark VII, Bill Blass, My abs system has seemed to stop working, doesnt want to allow the breaks to stay pumped up... when car is running brakes are gone completely... ive replaced the rotors,...


I have not heard of an ABS causing these problems. Usually, a loss of pressure is a hole in a brakeline or a bad master cylinder.

The first brakelines to leak on my 1988 Bill Blass where those going under the engine. Check in the frame where the lines are routed from the ABS to the front brakes.

I use a Vacuum Handpump Bleeder. As long as there is fluid in the Master, you should eliminate the air. If you have a leak when you draw down each wheel you may hear a whistling, deflating ballonlike sound of the air draw. My handpump has a gauge which will show a pressure drop.

Or you can go the other direction and disconnect the ABS lines to the wheels. When you draw the vacuum from the closed Calipers, there should be little air in the lines. However, a hole in the line will continue to drop the draw from that particular wheel Caliper. This would prove you have an opening in the line.

Oct 10, 2010 | 1991 Lincoln Mark VII

1 Answer

This beautifully kept 1990 Mark Vll LSC has only 44,000 miles on it. After avoiding an accident and slamming the brakes experiencing great ABS performance, I notice third gear in regular drive is out....


HI, there isn't a fuse that can cause your 3rd gear failure and since driving it like this will only cause more damage to the transmission, and the Airbag light is telling you the system is not working. I strongly recommend you take to your service center. Glad your ABS did its job.

Aug 26, 2010 | 1990 Lincoln Mark VII

2 Answers

I replaced the brake master cylinder on my 91 Lincoln Mark 7 with a non high pressure master cylinder and the rear brakes do not hold. Do I need to change the cal. on the rear also?


ANTI-LOCK BRAKE SYSTEM (and HCU-Hydraulic Control Unit)
General Information The 4-Wheel Anti-lock Brake System (ABS) is an electronically operated, all wheel brake control system. Major components include the power brake booster, master cylinder, the wheel speed sensors, and the Hydraulic Control Unit (HCU) which contains the control module, a relay, and the pressure control valves. The system is designed to ****** wheel lockup during periods of high wheel slip when braking. Retarding wheel lockup is accomplished by modulating fluid pressure to the wheel brake units. When the control module detects a variation in voltage across the wheel speed sensors, the ABS is activated. The control module opens and closes various valves located inside the HCU. These valves, called dump and isolation valves, modulate the hydraulic pressure to the wheels by applying and venting the pressure to the brake fluid circuits. Some models are equipped with a Traction Assist (TA) system. The TA system senses wheel spin upon acceleration, turns on the Hydraulic Control Unit (HCU) pump and applies fluid pressure to the appropriate rear wheel. Two additional isolation valves in the HCU will also close to permit fluid to flow only to the rear wheels. The TA system monitors TA usage to avoid overheating the rear brakes. If the system does sense brake overheating, the ABS module will inhibit TA operation until the rear brakes are permitted to cool down.
---
SYSTEM COMPONENTS The anti-lock brake system consists of the following components:
  • Vacuum booster and master cylinder assembly
  • Hydraulic Control Unit (HCU)
  • ABS module
  • Wheel sensors
  • Pedal travel switch
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On 1992-1994 and 1995-00 a scanner is used to perform the brake bleed. But on yours, I think it's different according to the manual.
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What do you mean change the cal. on the rear also? Do you mean Caliper?

Jul 26, 2010 | 1991 Lincoln Mark VII

1 Answer

How do I change a 1986 Lincoln Mark VII ABS brake system over to a standard or power brake system where do I buy the parts..


just disconnect the ABS control module, the system will then default to standard brakes, you will however have a ABS warning light on all the time.

Feb 06, 2010 | 1990 Lincoln Mark VII

1 Answer

Abs brake light on, brake light too, hard pedal, new pads and good rotors, no pressure to rear calipers? Fluid level went low, somewhere, than came back, overflowing after filling. No body can find parts...


actually you may not need to replace any parts. from what you are explaining on the vehicle you have a air lock in your brake lines. try and bleed the brakes again starting from the rear passenger than the drivers passenger than the passengers front and last the drivers front. than disconnect the negative battery cable for about 5 min to reset the lights and see what happens. please let me know if you need more assistance with this problem.
please do not forget to rate and comment about your expereince with fixya today.

Dec 27, 2009 | 1990 Lincoln Mark VII

2 Answers

CAN I REPLACE AN ABS POWER BOSTER &MASTER CYLINDERWITH A NEW NON ABS PAIRON MY 88 LSC


yes you can using a brake booster and master cylinder from a 1984-86.5 Mustang SVO Try searching some of the lincoln forums

Jun 25, 2009 | 1988 Lincoln Mark VII

1 Answer

Rear brakes wont bleed. Sucks fluid in when brakes applied. Has ABS.


try this. open the two bleeder screw at the rear calipers. leave it open untill the fluid drips generously. close the bleeder. try the brakes. if it works bleed it the nornal way. note: make sure you dont run out of fluid in the master cylinder

Jun 02, 2009 | 1991 Lincoln Mark VII

1 Answer

Brake promblem with a lincoln mark VII


Hi! Sir; Your rear braking system need refurbishing.I think this will solve the problem.

Dec 13, 2008 | 1989 Lincoln Mark VII

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